Why Your Claude Code UI Output Drifts and How a Structured Spec Fixes It
If you've been using Claude Code for UI work and fighting output drift — where repeated prompts return inconsistent layouts that never converge — the root cause probably isn't your prompt quality. According to a detailed post on r/ClaudeAI, the actual issue is format: Claude Code expects structured specs, not prose descriptions.
Prose vs. Structured Specs: What Changed
The author reports that describing UI in prose ('button on the left, slightly rounded corners, modern look') yields inconsistent results. Switching to a structured spec with exact hex codes, exact font weights, exact spacing, every screen state, and every transition collapsed the output from 'interpretive' to 'this is the thing.' When the model stops guessing, drift disappears.
Practical Workflow: Screen Recording → MCP Server
Manually writing a detailed spec is impractical. The author realized most developers already have the necessary source material: screen recordings (App Store demos, design walkthroughs, dev recordings). The missing piece was a way to convert those recordings into Claude's structured format. So they built and open-sourced an MCP server that does exactly that. Vision runs through your own Claude subscription, so there's no API key dance.
Key Takeaway
The tool is secondary to the workflow shift: stop describing layouts in prose. If you're doing UI work with Claude Code, provide a structured spec with concrete values. The post author asks: what's your current prompt-to-output workflow for UI work?
📖 Read the full source: r/ClaudeAI
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